fix(glpiselectfield,dropdownfield): prevent php warning

Author: btry

inc/field/dropdownfield.class.php

@@ -602,7 +602,7 @@ private function getMyGroups($userID) {
    }
 
    public function equals($value): bool {
-      $value = html_entity_decode($value);
+      $value = html_entity_decode($value ?? '');
       $itemtype = $this->question->fields['itemtype'];
       $dropdown = new $itemtype();
       if ($dropdown->isNewId($this->value)) {
@@ -624,7 +624,7 @@ public function notEquals($value): bool {
    }
 
    public function greaterThan($value): bool {
-      $value = html_entity_decode($value);
+      $value = html_entity_decode($value ?? '');
       $itemtype = $this->question->fields['itemtype'];
       $dropdown = new $itemtype();
       if (!$dropdown->getFromDB($this->value)) {
@@ -643,7 +643,7 @@ public function lessThan($value): bool {
    }
 
    public function regex($value): bool {
-      $value = html_entity_decode($value);
+      $value = html_entity_decode($value ?? '');
       $itemtype = $this->question->fields['itemtype'];
       $dropdown = new $itemtype();
       if (!$dropdown->getFromDB($this->value)) {

inc/field/glpiselectfield.class.php

@@ -160,7 +160,7 @@ public function buildParams($rand = null) {
    }
 
    public function equals($value): bool {
-      $value = html_entity_decode($value);
+      $value = html_entity_decode($value ?? '');
       $itemtype = $this->getSubItemtype();
       $item = new $itemtype();
       if ($item->isNewId($this->value)) {
@@ -177,7 +177,7 @@ public function notEquals($value): bool {
    }
 
    public function greaterThan($value): bool {
-      $value = html_entity_decode($value);
+      $value = html_entity_decode($value ?? '');
       $itemtype = $this->getSubItemtype();
       $item = new $itemtype();
       if (!$item->getFromDB($this->value)) {